Monel 400 Threaded FlangeASTM B564 · ASME B16.5 · Manufacturer, stockist & exporter, India
Alloy 400 · UNS N04400 · THD
A Monel 400 threaded flange is a flange with a tapered internal thread that screws onto threaded pipe, made from Monel 400 to ASTM B564. Use a threaded flange where welding is not allowed — for example in explosive areas — on small-bore, low-pressure lines. Threads are NPT to ASME B1.20.1.
- ASTM B564
- ASME B16.5
- EN 10204 3.1 / 3.2
- Export packing
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
What is a Monel 400 Threaded Flange?
- What it is
- A flange with a tapered internal thread that screws onto threaded pipe
- Material
- ASTM B564
- Dimensions
- ASME B16.5 · ASME B1.20.1
- Grade
- Monel 400 · UNS N04400
- Best at
- Seawater, hydrofluoric acid and marine service
Monel 400 Threaded Flange Specification
| Product | Monel 400 Threaded Flange |
|---|---|
| Material standard | ASTM B564 |
| Dimensional standard | ASME B16.5 · ASME B1.20.1 |
| Sizes | ½" – 24" (ASME B16.5) · 26" – 60" (ASME B16.47) |
| Pressure class | Class 150, 300, 400, 600, 900, 1500, 2500 · PN 6 – PN 100 |
| Facing | RF · FF · RTJ · tongue & groove |
| Bore | To match pipe schedule (state on order) |
| Testing | PMI · dimensional · NDT and IGC on request |
| Documents | EN 10204 3.1 · 3.2 with third-party inspection |
When to Choose a Threaded Flange
Use a threaded flange where welding is not allowed — for example in explosive areas — on small-bore, low-pressure lines. Threads are NPT to ASME B1.20.1.
- NPT threads to ASME B1.20.1
- Not for cyclic or high-temperature service
- Seal-welding is sometimes added after make-up
More on choosing: Threaded flange guide.
Monel 400 Threaded Flange: Why 400 for threaded flanges
Use a threaded flange where welding is not allowed — for example in explosive areas — on small-bore, low-pressure lines. Threads are NPT to ASME B1.20.1. In Monel 400, the choice usually comes down to the medium and temperature — the rows here are the points buyers check for this exact combination.
| Why this grade | Nickel-alloy flanges are used where acids, chlorides or heat defeat stainless. Monel 400 is picked for seawater, hydrofluoric acid and marine service. |
|---|---|
| Typical service | Marine — Pump shafts, valves and seawater piping. |
| B16.5 material group | 3.4 |
| Bolting | B7 (coated), B8M or nickel-alloy studs such as Monel 400 from ASTM B164, as the project specifies |
| Welding to carbon steel | A nickel-base filler such as ERNiCr-3 (or ERNiCrMo-3) is used when joining it to carbon steel |
| Matching filler | ERNiCu-7 (AWS A5.14) |
| Sour service | Listed in NACE MR0175 / ISO 15156-3 within its limits — state it on the order |
Monel 400 Threaded Flange Chemical Composition
| Element | Weight % |
|---|---|
| Nickel (+Co) | 63.0 min |
| Copper | 28.0 – 34.0 |
| Iron | 2.5 max |
| Manganese | 2.0 max |
| Carbon | 0.3 max |
| Silicon | 0.5 max |
| Sulphur | 0.024 max |
Monel 400 Threaded Flange Mechanical Properties
| Annealed plate | Value |
|---|---|
| Tensile strength | 480 MPa · 70 ksi |
| Yield strength 0.2% | 195 MPa · 28 ksi |
| Elongation | 35% |
Full chemistry, properties and equivalents are on the Monel 400 grade page.
Other Monel 400 flanges
Monel 400 Threaded Flanges for export
FOB / CIF · Nhava Sheva (JNPT), MumbaiMonel 400 Threaded Flange dimensions — ASME B16.5 Class 150 & 300
Outside diameter, thickness and bolting are set by size and class. Values in mm; thickness excludes the 1.6 mm raised face.
| NPS | Cl 150 OD | Cl 150 thickness | Cl 150 bolt circle | Cl 150 bolts | Cl 300 OD | Cl 300 thickness | Cl 300 bolt circle | Cl 300 bolts |
|---|---|---|---|---|---|---|---|---|
| ½" | 90 | 9.6 | 60.3 | 4 × ½" | 95 | 12.7 | 66.7 | 4 × ½" |
| 1" | 110 | 12.7 | 79.4 | 4 × ½" | 125 | 15.9 | 88.9 | 4 × ⅝" |
| 1½" | 125 | 15.9 | 98.4 | 4 × ½" | 155 | 19.1 | 114.3 | 4 × ¾" |
| 2" | 150 | 17.5 | 120.7 | 4 × ⅝" | 165 | 20.7 | 127.0 | 8 × ⅝" |
| 3" | 190 | 22.3 | 152.4 | 4 × ⅝" | 210 | 27.0 | 168.3 | 8 × ¾" |
| 4" | 230 | 22.3 | 190.5 | 8 × ⅝" | 255 | 30.2 | 200.0 | 8 × ¾" |
| 6" | 280 | 23.9 | 241.3 | 8 × ¾" | 320 | 35.0 | 269.9 | 12 × ¾" |
| 8" | 345 | 27.0 | 298.5 | 8 × ¾" | 380 | 39.7 | 330.2 | 12 × ⅞" |
| 10" | 405 | 28.6 | 362.0 | 12 × ⅞" | 445 | 46.1 | 387.4 | 16 × 1" |
| 12" | 485 | 30.2 | 431.8 | 12 × ⅞" | 520 | 49.3 | 450.8 | 16 × 1⅛" |
Full chart: ASME B16.5 flange dimensions.
Monel 400 Threaded Flange — questions buyers ask
Can threaded flanges be used in high-pressure service?
They are rated like other flanges in their class, but threaded joints are not recommended for cyclic, high-temperature or highly corrosive service.
What pressure rating does a Monel 400 threaded flange have?
It depends on class and temperature. Monel 400 forgings are in ASME B16.5 material group 3.4; read your class column in that group's table at the design temperature.
Can Monel 400 threaded flanges be welded to carbon steel?
Yes — a nickel-base filler such as ERNiCr-3 (or ERNiCrMo-3) is used when joining it to carbon steel.
Which standard covers Monel 400 threaded flanges?
The material is ASTM B564; dimensions follow ASME B16.5 · ASME B1.20.1. Always state both on your purchase order, with the edition if your project specifies one.
What decides the price of a Monel 400 threaded flange?
The alloy price, the size and pressure class, quantity, and the testing and documents required. Send your list and we quote the same working day.
Can you supply Monel 400 threaded flanges to NACE MR0175?
Yes. Monel 400 is listed in NACE MR0175 / ISO 15156-3 within its limits; state NACE compliance on the order and it is confirmed on the certificate.
What documents do you supply?
EN 10204 3.1 mill certificates as standard, 3.2 with third-party inspection on request, plus dimensional and PMI reports.
Sources: the ASTM / ASME specifications named on this page and producer datasheets · Last updated October 2026